starrett-webber gage blocks

Transcription

STARRETT-WEBBER
GAGE BLOCKS
STARRETT-WEBBER
GAGE BLOCKS
Precision Gage Blocks, Standard Reference Bars, Angle Gage Blocks,
True Squares, Optical Polygons and Targets
The first part of this section is devoted to GAGE BLOCKS and
STANDARD REFERENCE BARS.
Gage Blocks – Major Product Characteristics
Precision gage blocks are the primary standards vital to
dimensional quality control in the manufacture of parts. The four
major characteristics that are necessary for a precision gage
block are accuracy, surface finish, wear resistance and
dimensional stability. Other factors are corrosion resistance,
hardness, thermal conductivity and coefficient of expansion.
The base material used for gage blocks is crucial in meeting the
above criteria. While many materials have been tried, the major
types available today are:
◆ Traditional high-grade steel gage blocks, which are
generally used in shop floor environments
◆ Tungsten Carbide gage blocks, which have the advantage of
being harder and longer wearing than steel. (Not available
from Webber.)
◆ Ceramic gage blocks have an advantage over regular steel.
They will outwear regular steel and they will not corrode
◆ Chromium Carbide gage blocks are considered the top of
the line – the finest available. They outwear regular steel and
ceramic. In addition, they will not corrode and are very stable
and accurate, and have exceptional “wringing” qualities
croblox® Chromium Carbide – the superior gage block
material. The reason that our Webber Gage Division emphasizes
gage blocks made from Chromium Carbide is because they are
the most stable measuring devices ever developed.
No one in the world except Starrett/Webber has produced the
accuracy and stability of our croblox® Grand Masters. They were
produced in 1955 of Chromium Carbide material to an accuracy
within one millionth of an inch (.0000254mm) and have been
checked periodically by the U.S. National Bureau of Standards
and the U.S. National Institute of Standards and Technology
(NIST) and have remained stable over this period.
446
Other Characteristics
Accuracy
All Starrett/Webber gage blocks meet or exceed all known
specifications. The flatness, parallelism and surface finish
necessary to achieve the required accuracies are the same as
or better than government requirements.
Stability
Starrett/Webber gage blocks do not change in size except
through normal wear. Gage block stability is a characteristic that
our Webber Gage Division has mastered with over seventy years
of experience. Our gage blocks have withstood the test of time.
Hardness
Steel blocks have a Rockwell “C” hardness of approximately
64-65. Chromium Carbide blocks have a Rockwell “C” hardness
of 71-73, with an unusually fine, hard grain structure which
gives them exceptional resistance to wear and abrasion.
Thermal Conductivity and Coefficient of Expansion
These are not important considerations when measurements are
taken in temperature-controlled environments. This is primarily
done when measuring to microinches or microns.
On the shop floor, where precision measurements are rarely finer
than .0002⬙ or 0.005mm, the coefficient of expansion of steel,
chromium carbide and ceramics is so close as to be negligible.
Thermal conductivity is important on the shop floor. However,
because it takes time for a gage block to move to the same
temperature as the work piece, we recommend setting the
gage block on a heat sink such as a large mass of metal that
is at the shop environment temperature.
STARRETT-WEBBER
GAGE BLOCKS
National Institute
of Standards and Technology
National Voluntary
Laboratory Accreditation Program
CALIBRATION LABORATORIES
NVLAP LAB CODE 200038-0
WEBBER GAGE DIVISION / L.S. STARRETT CO.
24500 Detroit Road
Cleveland, OH 44145
Phone: 440-835-0001 Fax: 440-892-9555
DIMENSIONAL
NVLAP Code: 20/DO3
Gage Blocks
How To Order Starrett Precision Gage Blocks
Gage Block Sets
Individual Gage Blocks
1. Order by catalog number.
1. Specify Shape, signified on the page by the following symbols:
2. Please specify if you require a Commercial Grade Calibration or
Master Grade Calibration. See the catalog page regarding our
Accreditied Gage Block Calibration Service near the end of this
section. A certificate of calibration provides individual readings
on each block and provides traceability to NIST. Webber gage
block calibrations are NVLAP® accredited by NIST. (We need the
end user’s name and address to place on the certificate.)
3. Specify if you require etched serial numbers. We can provide
numbers up to a 6-digit maximum. (Our standard practice is to
put the same etch number on each block in a set. Blocks are
differentiated by their marked size.)
The buyer of Webber products listed in this catalog agrees to the
100% Relaxed Acceptance Rule contained in ASME B89.7.3.1
(Guidelines for Decision Rules: Considering Measurement
Uncertainty in Determining Conformance to Specifications.)
Products may not be rejected by the purchaser unless his
measurements exceed the published tolerances by more than his
uncertainty of measurement.
NVLAP® accreditation does not constitute an endorsement of any
product by NVLAP® or any agency of the U.S. government.
◆ Rectangular
◆ Square
◆ Heavy Duty
•
•
•
2. Specify Material (croblox®, steel, or ceramic)
3. Specify Unit of Measure (inch or metric)
4. Specify the Size
5. Specify Special Lengths, if applicable (Rectangular Only)
• Thin block sets (28 pc. inch and 17 pc. metric) are all 1.115⬙
(28.3mm) long. Specify “SS” length
• .050⬙, .100⬙, and .150⬙ blocks in inch 81-92 pc. sets are
1.380 long. Specify the Long length, “L”
• .100⬙ blocks contained in the 36, 38, and 43 pc. sets are
1.380⬙ long. Specify the Long length, “L”
6. Specify Accuracy Grade (see next page)
7. Please specify if you require a Commercial Grade
Calibration or Master Grade Calibration. See the catalog page
regarding our Accreditied Gage Block Calibration Service near
the end of this section. A certificate of calibration provides
individual readings on each block and provides traceability to
NIST. Webber gage block calibrations are NVLAP® accredited by
NIST. (We need the end user’s name and address to place on the
certificate.)
8. Specify if you require etched serial numbers. We can provide
numbers up to a 6-digit maximum.
447
STARRETT- WEBBER
GAGE BLOCKS
Gage Block Tolerances: B89.1.9
Inch System: Tolerances expressed in microinches (.000001⬙) 1 millionth of an inch
Order Webber Grade AA
B89.1.9 Grade 00
Order Webber Grade LM
Thru .050⬙
Thru .400⬙
Thru 1⬙
Thru 2⬙
Thru 3⬙
Thru 4⬙
Thru 5⬙
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
+1.2/-1.2
+1.2/-1.2
+1.2/-1.2
+2.0/-2.0
+3.0/-3.0
+4.0/-4.0
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
+4/-4
+3/-3
+3/-3
+4/-4
+5/-5
+6/-6
+8/-8
2
2
2
2
3
3
3
2
2
2
2
Rect.: 2, Sq.: 3
Rect.: 2, Sq.: 3
Rect.: 2, Sq.: 3
+6/-6
+5/-5
+6/-6
+8/-8
+10/-10
+12/-12
+16/-16
4
4
4
4
4
5
5
4
4
4
4
4
4
4
+8/-8
+10/-10
+10/-10
+12/-12
+14/-14
+18/-18
+20/-20
3
4
4
4
4
5
6
Rect.: 2, Sq.: 3
4
4
4
4
4
4
+16/-16
+20/-20
+20/-20
+24/-24
+28/-28
+36/-36
+44/-44
5
6
6
6
7
8
10
4
6
6
6
6
6
6
Thru 6⬙
Thru 7⬙
Thru 8⬙
Thru 10⬙
Thru 12⬙
Thru 16⬙
Thru 20⬙
Not Available from Webber
B89.1.9 Grade AS1
Thru .050⬙
Thru .400⬙
Thru 1⬙
Thru 2⬙
Thru 3⬙
Thru 4⬙
Thru 5⬙
Thru 6⬙
Thru 7⬙
Thru 8⬙
Thru 10⬙
Thru 12⬙
Thru 16⬙
Thru 20⬙
B89.1.9 Grade AS2
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
+12/-12
+8/-8
+12/-12
+16/-16
+20/-20
+24/-24
+32/-32
+32/-32
+40/-40
+40/-40
+48/-48
+56/-56
+72/-72
+88/-88
6
6
6
6
6
8
8
8
10
10
10
10
12
14
6
6
6
6
6
6
6
6
7
7
7
7
7
7
+24/-24
+18/-18
+24/-24
+32/-32
+40/-40
+48/-48
+64/-64
+64/-64
+80/-80
+80/-80
+104/-104
+112/-112
+144/-144
+176/-176
12
12
12
12
14
14
16
16
16
16
18
20
20
24
10
10
10
10
10
10
10
10
10
10
10
10
10
10
◆ B89.1.9 Grade 00 exceeds DIN, ISO, BS Grades K
448
Order Webber Grade A1
B89.1.9 Grade 0
Suggested Replacement Grades
for GGG-G-15C
GGG-G-15C Webber
B89.1.9
Grade
Grade
Grade
0.5
LM
—
1
AA
00
2
A1
0
3
A
AS1
NOTE: The above replacement grades are
suggested in B89.1.9. However, the tolerances
specified in GGG-G-15C and B89.1.9 are
not exactly the same. Gage blocks meeting
B89.1.9 specifications may not meet
GGG-G-15C requirements and vice versa.
MATERIAL COEFFICIENTS OF THERMAL EXPANSION ARE:
Chromium Carbide 4.7 x 10-6 inch/ºF per inch
SAE 52100 Steel 6.4 x 10-6 inch/ºF per inch
Ceramic 5.5 x 10-6 inch/ºF per inch
STARRETT-WEBBER
GAGE BLOCKS
Gage Block Tolerances: B89.1.9
Metric System: Tolerances expressed in micrometers (0.001mm)
Order Webber Grade AA
B89.1.9 Grade 00
Order Webber Grade LM
Thru 0.5mm
Thru 10mm
Thru 25mm
Thru 50mm
Thru 75mm
Thru 100mm
Thru 125mm
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
Size
Tolerance
Variation
in Length Flatness
Tolerance Tolerance
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
+.03/-.03
+.03/-.03
+.04/-.04
+.05/-.05
+.08/-.08
+.10/-.10
.03
.03
.03
.03
.03
.03
.03
.03
.03
.03
.03
.03
+.10/-.10
+.07/-.07
+.07/-.07
+.10/-.10
+.12/-.12
+.15/-.15
+.20/-.20
.05
.05
.05
.06
.07
.07
.08
.05
.05
.05
.05
Rect (.05), Sq. (.07)
Rect (.05), Sq. (.07)
Rect (.05), Sq. (.07)
+.14/-.14
+.12/-.12
+.14/-.14
+.20/-.20
+.25/-.25
+.30/-.30
+.40/-.40
.10
.10
.10
.10
.12
.12
.14
.10
.10
.10
.10
.10
.10
.10
+.20/-.20
+.25/-.25
+.25/-.25
+.30/-.30
+.35/-.35
+.45/-.45
+.50/-.50
.08
.09
.09
.10
.10
.12
.14
Rect (.05), Sq. (.07)
.10
.10
.10
.10
.10
.10
+.40/-.40
+.50/-.50
+.50/-.50
+.60/-.60
+.70/-.70
+.90/-.90
+1.1/-1.1
.14
.16
.16
.16
.18
.20
.25
.10
.15
.15
.15
.15
.15
.15
Thru 150mm
Thru 175mm
Thru 200mm
Thru 250mm
Thru 300mm
Thru 400mm
Thru 500mm
B89.1.9 Grade AS1
Thru 0.5mm
Thru 10mm
Thru 25mm
Thru 50mm
Thru 75mm
Thru 100mm
Thru 125mm
Thru 150mm
Thru 175mm
Thru 200mm
Thru 250mm
Thru 300mm
Thru 400mm
Thru 500mm
Order Webber Grade A1
B89.1.9 Grade 0
B89.1.9 Grade AS2
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
Size
Tolerance
Variation
in Length
Tolerance
Flatness
Tolerance
+.30/-.30
+.20/-.20
+.30/-.30
+.40/-.40
+.50/-.50
+.60/-.60
+.80/-.80
+.80/-.80
+1.0/-1.0
+1.0/-1.0
+1.2/-1.2
+1.4/-1.4
+1.8/-1.8
+2.2/-2.2
.16
.16
.16
.18
.18
.20
.20
.20
.25
.25
.25
.25
.30
.35
.15
.15
.15
.15
.15
.15
.15
.15
.18
.18
.18
.18
.18
.18
+.60/-.60
+.45/-.45
+.60/-.60
+.80/-.80
+1.0/-1.0
+1.2/-1.2
+1.6/-1.6
+1.6/-1.6
+2.0/-2.0
+2.0/-2.0
+2.4/-2.4
+2.8/-2.8
+3.6/-3.6
+4.4/-4.4
.30
.30
.30
.30
.35
.35
.40
.40
.40
.40
.45
.50
.50
.60
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
.25
◆ B89.1.9 Grade 00 exceeds DIN, ISO, BS Grades K
Suggested Replacement Grades
for GGG-G-15C
GGG-G-15C Webber
B89.1.9
Grade
Grade
Grade
0.5
LM
—
1
AA
00
2
A1
0
3
A
AS1
NOTE: The above replacement grades are
suggested in B89.1.9. However, the tolerances
specified in GGG-G-15C and B89.1.9 are
not exactly the same. Gage blocks meeting
B89.1.9 specifications may not meet
GGG-G-15C requirements and vice versa.
MATERIAL COEFFICIENTS OF THERMAL EXPANSION ARE:
Chromium Carbide 8.5 x 10-6 m/ºC per m
SAE 52100 Steel 11.5 x 10-6 m/ºC per m
Ceramic 9.9 x 10-6 m/ºC per m
449
STARRETT-WEBBER
GAGE BLOCKS
All sets are furnished in a handsome, rugged
wood case for lasting protection.
Inch System Gage Block Sets, Individual Blocks and Accessories
The following pages include these Inch System items in the
order shown:
Rectangular gage blocks and accessories
•
450
•
Square gage blocks and accessories
•
Heavy-duty gage blocks and accessories
STARRETT-WEBBER
GAGE BLOCKS
Rectangular croblox® – Inch System
Gage Block Sets in Case
Accuracy
Grade*
B89.1.9 0
Measuring Range
Blocks
Per Set
B89.1.9 00
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
81
Webber LM
B89.1.9 0
B89.1.9 00
Webber LM
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
88
B89.1.9 0
B89.1.9 00
.200-8.000 in Steps of .001
.300-8.000 in Steps of .0001
34
Webber LM
B89.1.9 0
B89.1.9 00
.020-.240 in Steps of .001
.040-.240 in Steps of .0001
.060-.240 in Steps of .00005
28
Inch
Blocks Included In Sets
9 Blocks .1001 Through .1009 (Steps of .0001)
4 Blocks 1.000 Through 4.000 (Steps of 1⬙)
Same as in RC 81. Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7/64
1 Block .500
3 Blocks 1.000, 2.000 and 4.000
1 Block .02005
Catalog No.
RC 81.A1
RC 81.AA
RC 81.LM
RC 88.A1
RC 88.AA
RC 88.LM
RC 34.A1
RC 34.AA
RC 34.LM
RC 28.A1
RC 28.AA
NOTES: For gage block accessories, order AC 11.A Accessory Set in Case.
Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master Grade Calibration Certificate is
available at extra cost.
* For complete accuracy specifications, see page at the beginning of this section.
451
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Ceramic – Inch System
Inch
Our Ceramic Gage Blocks, offered in
rectangular, inch and metric, fill the gap
between steel and the universally accepted
croblox®. While not as stable as croblox®,
ceramic is an excellent alternative to steel
because of its superior hardness, thermal
expansion and wear characteristics.
Set No. RY 34.A1.
Accuracy
Grade*
B89.1.9 0
B89.1.9 00
B89.1.9 0
B89.1.9 00
Measuring Range
Blocks
Per Set
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
81
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
88
B89.1.9 0
.200-8.000 in Steps of .001
.300-8.000 in Steps of .0001
B89.1.9 00
34
Catalog No.
RY 81.A1
Same as in RY 81. Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7/64
RY 88.A1
1 Block .500
3 Blocks 1.000, 2.000 and 4.000
RY 81.AA
RY 88.AA
RY 34.A1
RY 34.AA
NOTE: Sets include etched serial number and Commercial Grade Calibration Certificate. A Master Grade Calibration Certificate is available at extra cost.
452
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Steel – Inch System
Measuring Range
Blocks Per Set
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
81
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
B89.1.9 Accuracy Grade 0*
Inch
Catalog No.
RS 81.A1
88
Same as in RS 81.A1 Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7/64
RS 88.A1
92
Same as in RS 88.A1 Set, Plus
2 Blocks .100⬙ (croblox® Wear Blocks)
2 Blocks .050 (croblox® Wear Blocks)
RS 92.A1
.100-4.000 in Steps of .001
.150-4.000 in Steps of .0001
.200-4.000 in Steps of .00005
38
.200-8.000 in Steps of .001
.300-8.000 in Steps of .0001
34
.020-.240 in Steps of .001
.040-.240 in Steps of .0001
.060-.240 in Steps of .00005
28
.0625-4.000 in Steps of .0625
.100-4.000 in Steps of .100
9
2 Blocks .050 (croblox® Wear Blocks)
1 Block .05005
2 Blocks 1.000 and 2.000
4 Blocks .100, .200, .300, .500
3 Blocks 1.000, 2.000, 4.000
1 Block .02005
1 Block .0625, .100, .125, .200, .250, .300,
.500, 1.000, 2.000
10
B89.1.9 Accuracy Grade AS1*
10 blocks .105, .210, .315, .420,
.500, .605, .710, .815, .920, 1.000
Micrometer Checking Set
RS 38.A1
RS 34.A1
RS 28.A1
RS 9.A1
RS 10.A
NOTES: For gage block accessories, order AC 11.A Accessory Set in Case.
See rectangular block accessories on the next page. Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master
Grade Calibration Certificate is available at extra cost. * For complete accuracy specifications, see page at the beginning of this section.
453
STARRETT-WEBBER
GAGE BLOCKS
MicroAccurate® – B-Grade Gage Block Sets In Case
Inch & Metric
These B-Grade gage block sets are Starrett
Global products. Their very affordable price
makes them ideal for general shop floor use.
Now, our initial Inch Sets are joined by four
Metric B-Grade Sets.
Etched, unique serial numbers are included
on each block. Custom numbers are not
available.
Sets are available with a choice of two types
of certificates of calibration as described
below.
Inch System sets have a tolerance of ±50
␮in.
Metric System sets have a tolerance of
±1.25 ␮m.
No. RS 81.B
Gage Block Sets
NEW
Measuring Range
Inch System Sets
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
Metric System Sets
3.0 Through 450 in .0005mm Steps
Metric System Sets
1.0 Through 250 in .01 mm Steps
Blocks Per Set
81
88
112
1 block .5mm
1 block 1.0005mm
9 blocks 1.001mm Through 1.009mm (Steps of .001mm)
18 blocks 1mm Through 9.5mm (Steps of .5mm)
10 blocks 10mm Through 100mm (Steps of 10mm)
1 block .5mm
1 block 1.0005mm
Catalog No.
RS 81.B
RS 81.W
RS 88.MW
RS 88.MB
RS 112.MW
RS 112.MB
Specifications
Catalog No. Features
RS 81.B
Calibration performed at Webber Gage in Cleveland, OH. Certificate of Calibration with NVLAP accreditation. Calibration in
accordance with ISO 17025 with dated calibration certificate and NIST traceability number. The name and address of the
RS 88.MB user may be added to the calibration certificate.
RS 112.MB Inch System (RS 81.B) uncertainty of measurement (k=2): ␮ = 6 + L where L is in inches, but ␮ not less than 7 ␮in.
Metric Systems (RS 88.MB & RS 112.MB) uncertainty of measurement (k=2): ␮ = 0.15 + .001L where L is in millimeters,
but ␮ not less than 0.18 ␮m.
RS 81.W
Calibration performed in China in partnership with Webber Gage. Webber Gage samples the measurements to monitor
the calibration results. Calibrations are traceable to NIST, but no NIST traceability number or dates will be given. The name
RS 88.MW and addrress of the user will be left blank on the calibration certificate.
RS 112.MW Inch System (RS 81.W) uncertainty of measurement (k=2): 10 ␮in.
Metric Systems (RS 88.MW & RS 112.MW) uncertainty of measurement (k=2): ␮ = 0.25 ␮m.
454
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Gage Block Accessories
Steel and croblox® – Inch System
Inch
Rectangular Steel and croblox® Accessories
Individually or Sets as stated below
Individual Accessories
Rectangular croblox®
Wear Blocks
Size
.020
.050
.100
Catalog No.
RC .020 WA1
RC .050 WA1
RC .100 WA1
** croblox® jaws available as an option at extra
cost. Please specify.
** Jaws are normally used in pairs, but are
ordered individually. Please order accordingly.
Description
Half-Round Jaw**
.250 Radius
Straight Jaw**
.250 Thick
Clamps
0–1-1/2 Capacity
1-1/2–4 Capacity
4–6-1/2 Capacity
0-12 Capacity
Scriber Point
Center Point, 100 C/L
Base Block 1 Thick
Case (CS 9111.)
Catalog No.
Steel croblox®
No. of Steel Accessories Included
81- 92 Block
Sets when ord.
Set No. AC 11.A w/ Acces.
RA 1.
2
2
2*
2*
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RA 4.
RA 24.
RA 5.
RA 6.
RA 7.
RA 8.
RA 11.
RA 12.
RA 13.
Additional Accessories
Clamps
0-18 Capacity
RA 9.
0-24 Capacity
RA 10.
0-36 Capacity
RA 14.
Half-Round Jaws
.200 Radius
RA 2.
.100 Radius
RA 3.
Square croblox® – Inch System GageBlock Sets in Case
Accuracy
Grade*
B89.1.9 0
B89.1.9 00
B89.1.9 0
B89.1.9 00
B89.1.9 0
B89.1.9 00
Measuring Range
Blocks
Per Set
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
81
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
88
.200-8.000 in Steps of .001
.300-8.000 in Steps of .0001
36
Inch
4 Blocks 1.000 Through 4.000 (Steps of 1)
Catalog No.
Same as in SC 81. Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7/64
SC 88.A1
1 Block .050
3 Blocks 1.000, 2.000, 4.000
•
SC 81.A1
SC 81.AA
SC 88.AA
SC 36.A1
SC 36.AA
NOTES: All Square croblox® sets above are available with accessories at extra cost. To order, add “X” to catalog number.
Accessories are furnished in steel (see following pages).
Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master Grade Calibration Certificate is available at extra cost.
455
STARRETT-WEBBER
GAGE BLOCKS
Square Steel – Inch System
Measuring Range
Blocks Per Set
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
81
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .000025
1/16-12.000 in Steps of 1/64
88
.200-8.000 in Steps of .001
.300-8.000 in Steps of .0001
36
.020-.240 in Steps of .001
.040-.240 in Steps of .0001
.060-.240 in Steps of .00005
28
5.000-84 in Steps of 1.000
8
5.000-84 in Steps of 1.000
8
Inch
Above Set also Available with ACCESSORIES** (Extra)
Same as in SS 81.A1 Set, Plus
3 Blocks .100025, .10005, .100075
4 Blocks 1/16, 5/64, 3/32, 7/64
Above Set also Available with ACCESSORIES** (Extra)
1 Block .050
3 Blocks 1.000, 2.000 and 4.000
Above Set Also Available with ACCESSORIES** (Extra)
1 Block .02005
8 Blocks 5, 6, 7, 8, 10, 12, 16, 20
Accessories Included:
6 Each SA 8. Studs
2 Each SA 9. Flat Head Screws (long)
2 Each SA 10. Flat Head Screws (short)
1 Each SA 16. 4 1/2 - 6⬙ Tie Rod (adjustable)
1 Each SA 17. 6 - 9⬙ Tie Rod (adjustable)
1 Each SA 18. 11 3/4⬙ Tie Rod
1 Each SA 19. 15 3/4⬙ Tie Rod
2 Each SA 20. 19 3/4⬙ Tie Rods
Catalog No.
Same as above SS 8.A1X
SS 81.A1
SS 88.A1
SS 36.A1
SS 28.A1
SS 8.A1X
SS 8.AAX
NOTES: ** All square steel sets 34 through 88 are available with accessories at extra cost. To order, add “X” to catalog number. Accessories are steel.
See square block accessories on the next page. Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master
Grade Calibration Certificate is available at extra cost.
456
•
STARRETT-WEBBER
GAGE BLOCKS
Internal Measuring
Machine Jaws
No. SA 708. croblox®
No. SA 707. Steel
Square Gage Block Accessories
Steel and croblox® – Inch System
•
Jaws are doubled-ended, self-proving,
assuring parallelism and squareness.
Designed for use with square style gage
blocks. Jaws are made of long-wearing
croblox® or steel material, 2.000 long,
1.000 wide and .500 thick. Both side
edges are lapped 90º square to the gaging
faces within 30 seconds of arc and extend
beyond the gage blocks in the combination,
thus forming a square master.
Jaw and gage combination parallelism is
quickly checked merely by turning the
combination to the opposite side and
rechecking the reading. Furnished in pairs.
No. SA 25.A.
Square Steel and croblox® Accessories
Individually or sets as stated below
Square croblox® Wear Blocks
Size
.100 With 1 Side
Countersunk
Catalog No.
SC .100 WA1
Catalog No.
Description
Steel
* croblox®
Tie Rods
11-3/4 Solid
SA 18.
15-3/4 Solid
SA 19.
19-3/4 Solid
SA 20.
Description
Half-Round Jaw**
.125 Radius
.250 Radius
Straight Jaw**
.500 Thick
Scriber Point
Center Point, .100 C/L
Base Block .500 Thick
Knurled Screw
Stud
Flat Head Screw
Long
Short
Slotted Nut
Tie Rods
3/4 Solid
1-1/2 Solid
2-1/4 Solid
3 Solid
4-1/2-6 Adjust
6-9 Adjust
Case (CS9168)
Catalog No.
Steel croblox®
Set No. SA 25.A and
81 thru 88 Block
34 and 36 Block
Sets when ordered Sets when ordered
with Accessories
with Accessories
SA 1.
SA 2.
2
2
SA 3.
SA 4.
SA 5.
SA 6.
SA 7.
SA 8.
SA 23.
2*
1
1
1
2
2
2
1
2
2
SA 9.
SA 10.
SA 11.
2
2
2
2
2
2
SA 12.
SA 13.
SA 14.
SA 15.
SA 16.
SA 17.
1
1
1
1
1
1
(For SA 25.A Only)
1
1
1
1
1
** croblox® jaws available as an option at extra cost. Please specify.
** Jaws are normally used in pairs, but are ordered individually. Please order accordingly.
457
STARRETT-WEBBER
GAGE BLOCKS
Individual Rectangular Gage Blocks - Inch System
croblox®, ceramic and steel
croblox®
AA
A1
Grade 00
0
•
•
Size/Inches
.010
.01005
.0101 Through .0109 in
Steps of .0001
Steps of .001
.020 (Wear Blocks)
.020 or .02005
Steps of .0001
Steps of .001
.030
.040
.050 long*
.050 (Wear Blocks)
.050S or .050SS
.05005
Steps of .0001
Steps of .001
.060 or .060SS
.0625 (1/16)
.070 or .070SS
.078125 (5/64)
.080 or .080SS
.090 or .090SS
.09375 (3/32)
.100 long*
.100 (Wear Blocks)
.100S
.100025
Ceramic
AA A1
00 0
Steel
A1
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
croblox®
AA
A1
Size/Inches
Grade 00
0
.10005
•
•
.100075
•
•
.1001 Through .1009 in •
•
Steps of .0001
.109375 (7/64)
•
•
•
•
Steps of .001
•
•
Steps of .001
•
•
Steps of .001
•
•
Steps of .001
•
•
Steps of .001
.150 Long*
•
•
.150
•
•
•
•
Steps of .010
.200, .250, .300, .350 •
•
.400, .450, .500,
•
•
.550, .600
.650, .700, .750
•
•
.800, .850, .900, .950 •
•
1.000
•
•
2.000
•
•
3.000
•
•
4.000
•
•
5.000
6.000
Inch
Ceramic
AA A1
00 0
•
•
•
•
Steel
A1
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Rectangular Block Sizes
◆ Width: all blocks are .352⬙ wide
◆ Length: for blocks under .050⬙, length is 1.115⬙
◆ For blocks with .050 through .190⬙, length is 1.180⬙
◆ For blocks .200⬙ and above, length is 1.380⬙
How To Order
◆ Specify in this sequence: shape, material, size and accuracy
grade
◆ Key: Shape
Material
Size
Accuracy
R=Rectangular S=Steel
(listed in table)
S=Square
C=croblox®
Y=Ceramic
◆ Example: RS .250A1 = Rectangular Steel block, size .250,
Grade A1 Accuracy
*Order long length for Webber set replacements.
458
Exceptions
◆ 28 block sets with blocks to .090⬙ are all 1.115⬙ long.
.050, .060, .070, .080, .090 blocks in this set are listed with
the suffix “ss”.
◆ .050, .100, .150⬙ blocks contained in the 81–92-piece sets
are 1.380⬙ long. Specify “long length”.
◆ .100⬙ block contained in the 36, 38, and 43-block sets are
1.380⬙ long. Specify “long length”.
STARRETT-WEBBER
GAGE BLOCKS
Individual Square Gage Blocks – Inch System
croblox® and steel
Size/Inches
Grade
.010
.020
.02005
Steps of .0001
Steps of .001
.030
.040
.050
.060
.0625 (1/16)
.070
.078125 (5/64)
.080
.090
.09375 (3/32)
.100
.100 (Wear with Chamfered Hole)
.100025
.10005
.100075
Steps of .0001
.109375 (7/64)
Steps of .001
Steps of .010
.200
.250
.300
.350
.400, .450, .500, .550
.600, .650, .700, .750
.800, .850, .900, .950
1.000
2.000
3.000
4.000
croblox®
AA
A1
00
0
Steel
A1
0
•
•
•
•
•
Inch
Square Steel Blocks Only
Size/Inches
5.000
6.000
7.000
8.000
10.000
12.000
16.000
20.000
Grade
AA
00
•
•
•
•
•
•
•
•
•
A1
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Square Block Size
◆ All square blocks are .950 x .950⬙
◆ Blocks have a .265⬙ hole in the center
◆ On blocks .200⬙ thick and over, the hole is countersunk on both faces
(croblox® Wear Blocks are countersunk on one face only)
How To Order
◆ Specify in this sequence: shape, material, size and accuracy grade
◆ Key:
Shape
Material
Size
Accuracy
R=Rectangular
S=Steel
(listed in table)
S=Square
C-croblox®
◆ Example: SS .125A1 = Square Steel block, size .125 with a
Grade A1 accuracy
459
STARRETT-WEBBER
GAGE BLOCKS
Heavy-Duty Steel – Inch System
Gage Block Sets and Accessories
Gaging Area
Inch
•
•
17/32 x 1-1/2⬙
These heavy-duty gage block sets are
primarily used for assembling together into
exclusive Webber fixtures.
Precision “yardsticks” and height gages
can be built up to a required dimension by
wringing blocks together and then by the
use of eccentric clamps, locking them into
place. All blocks over 1⬙ long have 1/4⬙
holes that accept eccentric clamps. All
blocks 6⬙ or larger have an insulated center
grip to eliminate temperature variations
caused by handling.
Precision scribers and dividers for tool
layout can be created in a few seconds.
The center point is on a .500⬙ center line
of a 1⬙ block. The scriber point may be
sharpened indefinitely without altering
the original accuracy.
No. HD 46.A1X.
Snap gages with inside or outside
calipers can be easily assembled using
accessories like the eccentric clamps, a
quick-acting clamp, and a pair of halfround or straight jaws.
Snap gage is used to check inside
dimensions of ring gage still mounted
in internal grinder.
Building up blocks into precision “yardsticks.”
Precision scribers, dividers and snap gages.
460
STARRETT-WEBBER
GAGE BLOCKS
Heavy-Duty – Inch System Accessories (continued)
Inch
•
•
Indicator Accessory Set
This heavy-duty accessory mounts on
any build-up of heavy-duty blocks and
measures the deviation of the work from
nominal or desired size. (Indicator is set
and checked for zero by placing blocks
on any known flat surface.)
HDA 10 and HDA 12 Indicator Accessory
Sets consist of a holding block, extension
jaw and a precision Starrett indicator. See
catalog description below for indicator
ranges and graduations.
Above: Eccentric clamps are used for combining long blocks.
Below: Quick-acting clamps are used for combining fractional inch blocks with blocks 1 or longer.
Left: Indicator Accessory Set.
Heavy-Duty Steel Accessories Individually or Sets as stated below
Wear Blocks
croblox® Wear Blocks in .050 and
.100 sizes are available for use with
heavy-duty blocks.
Size
.050
.100
Catalog No.
HDC .050 WA1
HDC .100 WA1
Description
Half-Round Jaw*
.500 Radius
Scriber Point
Center Point, .500 C/L
Eccentric Clamp
Quick-Acting Clamp
Base Block 1.500 Thick
All 42 thru 46 Piece Sets or 84 Piece
Catalog No. Set when ordered with Accessories
HDA 1.
HDA 2.
HDA 3.
HDA 4.
HDA 5.
HDA 6.
2
1
1
(See set description next page for qty.)
1
1
Straight Jaw*
1.000 Thick
HDA 820.
Indicator Set Consisting of Indicator
Holding Block, Extension Jaw
(1.000 Thick), Indicator with
±.010 Range .0005 Graduations,
and Case
HDA 10.
Indicator Set As Above Except
Indicator With ±.0015 Range
.00005 Graduations
HDA 12.
* Jaws are normally used in pairs, but are ordered individually. Please order accordingly.
461
STARRETT-WEBBER
GAGE BLOCKS
Heavy-Duty Steel – Inch System
Gage
Block
Steel Gage
BlockSets
Sets inand
Case Accessories
–
17/32⬙ x 1-1/2⬙ Gaging Area
Measuring Range
.100-12.000 in Steps of .001
.200-12.000 in Steps of .0001
.300-12.000 in Steps of .00005
•
Inch
Blocks
Per Set
84
.200-48.000 in Steps of .001
.300-48.000 in Steps of .0001
46
.200-36.000 in Steps of .001
.300-36.000 in Steps of .0001
44
.200-24.000 in Steps of .001
.300-24.000 in Steps of .0001
42
2 Blocks .100 Wear croblox®
1 Block .10005
3 Eccentric Clamps
Above Set Also Available With 2 Additional
Eccentric Clamps and Accessories** (Extra)
6 Blocks 6.000
10 Eccentric Clamps and Accessories** (Included)
4 Blocks 6.000
2 Blocks 6.000
Catalog No.
HD 84.A1
HD 46.A1X
HD 44.A1X
HD 42.A1X
NOTES: Case for HD 84.A1 has space for accessories and six 6.000⬙ heavy-duty blocks. To order with accessories, add “X” to catalog number.
** See previous page for details.
Individual Heavy-Duty Gage Blocks – Steel Only
Block Size
.050
.100, .100025, .10005, .100075
.1001 Through .1009 In Steps of .0001
NOTES: Sets include etched serial numbrs and
Commercial Grade Calibration Certificate. A
Master Grade Calibration Certificate is available
at extra cost.
Separate cases for Gage Block Sets are
also available.
462
•
1.000
2.000
3.000
4.000
6.000
6.000 Heavy-Duty Block with
Eccentric Clamp and Case
10.000
20.000
To order individual blocks, specify HD followed by size and accuracy grade. Example: HD .050 A1
STARRETT-WEBBER
GAGE BLOCKS
Metric System Gage Block Sets, Individual Blocks and Accessories
The following pages include these metric
system items in the order shown:
Rectangular gage blocks
and accessories
•
Square gage blocks and
accessories
Metric rectangular 88 piece and square 112 sets are shown.
Mini-Metric Rectangular
Steel Gage Block Set
No. RS 9.MA1
This mini-metric set of precision gage
blocks calibrates micrometers, vernier
gages and similar measuring tools. The
gage blocks are also useful as setting
masters for comparator-type dimensional
gages and are useful in teaching the basics
of metric measurement.
The set has a capacity of 61mm in 1,
0.5mm or 0.25mm steps. Its nine hardened
steel blocks include these sizes: 1, 2, 2.25,
2.5, 3, 5, 10, 15 and 25mm. They are
finished to B89.1.9 Accuracy Grade 0 and
are furnished in a lined
metal case.
Metric re set No. RS 9.MA1
463
STARRETT-WEBBER
GAGE BLOCKS
Rectangular croblox® – Metric System
Metric
One Millimeter Base
Accuracy
Grade*
Measuring Range
B89.1.9 0
3.0 Through 450 (Steps of .001mm)
B89.1.9 00
B89.1.9 0
B89.1.9 00 1.0 Through 450 (Steps of .1mm)
B89.1.9 0
B89.1.9 00
Blocks
Per Set Blocks Included In Sets
9 Blocks 1.001mm Through 1.009mm (Steps of .001mm)
45
9 Blocks 1mm Through 9mm (Steps of 1mm)
1 Block .5mm
1 Block 1.0005mm
88
18 Blocks 1mm Through 9.5mm (Steps of .5mm)
1 Block .5mm
1 Block 1.0005mm
112
48 Blocks 1mm Through 24.5mm (Steps of .5mm)
Catalog No.
RC 45.MA1
RC 45.MAA
RC 88.MA1
RC 88.MAA
RC 112.MA1
RC 112.MAA
NOTE: Sets include etched serial numbers and Commercial Grade Calibration Certificate. Metric croblox® Wear Blocks and/or Master Grade Calibration
Certificate are available at extra cost. For gage block accessories, order AC 11.MA Metric Accessory Set in Case.
For
complete
accuracy specifications, see page at the beginning of this section.
*
464
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Ceramic – Metric System
Metric
Now there’s another addition to the famous
Starrett-Webber line of precision gage
blocks. Ceramic, offered in rectangular, inch
and metric, fills the gap between steel and
the universally accepted croblox®. While not
as stable as croblox®, ceramic is an
excellent alternative to steel because of its
superior hardness, thermal expansion and
wear characteristics.
Set No. RY 88.MA1.
Accuracy
Grade*
B89.1.9 0
B89.1.9 00
B89.1.9 0
B89.1.9 00
Measuring Range
Blocks
Per Set
45
2.0 Through 450 in .001mm Steps 88
1 block .5mm
1 block 1.0005mm
Catalog No.
RY 45.MA1
RY 45.MAA
RY 88.MA1
RY 88.MAA
NOTE: Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master Grade Calibration Certificate is available at extra cost.
465
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Steel – Metric System
One Millimeter Base
Measuring Range
1.0 Through 61.0 in 1.0mm Steps
2.0 Through 61.0 in .5mm Steps
Blocks
Per Set
9
45
88
112
Micrometer Checking Set
10
Blocks Included in Sets
3 blocks 1.0mm, 2.0mm, 2.25mm
4 blocks 2.5mm, 3.0mm, 5.0mm, 10.0mm
2 blocks 15.0mm, 25.0mm
1 block .5mm
1 block 1.0005mm
1 block .5mm
1 block 1.0005mm
B89.1.9 Accuracy Grade AS1*
10 blocks 2.5mm, 5.1mm, 7.7mm, 10.3mm, 12.9mm
15.0 mm, 17.6mm, 20.2mm, 22.8mm, 25.0mm
NOTES: No. AC 11.MA Metric Accessory Set in Case, metric croblox Wear Blocks in sets, etched
serial numbers, and Certificate of Calibration are all available at extra cost.
See rectangular metric block accessories on the next page.
For
complete
*
®
466
Metric
Catalog No.
RS 9.MA1
MINI-METRIC
RS 45.MA1
RS 88.MA1
RS 112.MA1
RS 10.MA
STARRETT-WEBBER
GAGE BLOCKS
Rectangular Gage Block Accessories
Steel and croblox® – Metric System
Metric
No. AC 11.MA.
®
Rectangular Steel and croblox Accessories
Rectangular croblox®
Wear Blocks
Size
1.0mm
2.0mm
Catalog No.
RCM 1.0 WA1
RCM 2.0 WA1
** croblox® jaws available as an option at extra
cost. Please specify.
** Jaws are normally used in pairs, but are
ordered individually. Please order accordingly.
Description
Half-Round Jaw**
5mm Radius
Straight Jaw**
5mm Thick
Clamps
0-38mm Capacity
38-100mm Capacity
100-165mm Capacity
0-300mm Capacity
Scriber Point
Center Point, 2mm C/L
Base Block, 25mm Thick
Case (CS 9111.)
Clamps
0-450mm Capacity
0-600mm Capacity
0-900mm Capacity
Catalog No.
Steel
croblox®
Set No. AC 11.MA
RA 101.
2
RA 104. RA 204.
2*
RA 5.
RA 6.
RA 7.
RA 8.
RA 11.
RA 112.
RA 113.
1
1
1
1
1
1
1
1
RA 9.
RA 10.
RA 14.
467
STARRETT-WEBBER
GAGE BLOCKS
Square Combination croblox® and Steel – Metric System
An ideal combination of value, price and convenience, these sets include a popular selection of croblox® and steel as listed.
Two Millimeter Base
Measuring Range
Blocks Per Set
45
45
88
112
Blocks** Included in Sets
9 Blocks 2.001 Through 2.009 (Steps of .001mm)
9 Blocks 1.0 Through 9.0 (Steps of 1.0mm)
9 Blocks 10 Through 90 (Steps of 10mm)
Same as Above Plus the Following Accessories:
1 pair SA 102. 6 mm Radius Jaws
1 each SA 4. Scriber Point
2 each SA 7. Knurled Screws
2 each SA 8. Studs
2 each SA 9. Flat Head Screws (long)
2 each SA 10. Flat Head Screws (short)
2 each SA 11. Slotted Nuts
1 each SA 12. 19mm Tie Rod
1 each SA 16. 114-152mm Tie Rod (adjustable)
1 Block .5mm
1 Block 2.0005mm
1 Block .5mm
1 Block 2.0005mm
Metric
•
Catalog No.
S2C 45.MA1
S2C 45.MA1X
S2C 88.MA1
S2C 112.MA1
**NOTE: All blocks are croblox®, except sizes below 1.5mm and above 10mm, which are steel.
NOTE: Metric croblox® Wear Blocks are available as option. Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master
Grade Calibration Certificate is available at extra cost.
For
complete
**
Internal Measuring Machine Jaws
croblox® No. SA 712.
Steel No. SA 711.
Double ended, self proving- assures parallelism and squareness.
Designed for use with square style gage blocks, jaws are made of
long-wearing croblox® or steel 50.8mm long, 25.4mm wide and
12mm thick. Both side edges are lapped 90º square to the gaging
faces within 30 seconds of arc and extend beyond the gage blocks in
the combination, thus forming a square master.
Jaw and gage combination parallelism is checked merely by turning
the combination to the opposite side and rechecking the reading.
Furnished in pairs.
468
STARRETT-WEBBER
GAGE BLOCKS
Square Steel – Metric System
Two Millimeter Base
Measuring Range
Blocks Per Set
45
45
88
112
125mm to 2100mm
8
125mm to 2100mm
8
Metric
B89.1.9 Accuracy Grade 0
Blocks Included in Sets
9 Blocks 1.0mm Through 9mm (Steps of 1.0mm)
Same as Above Plus the Following Accessories:
1 Pair SA 102. 6mm Radius Jaws
1 Each SA 4. Scriber Point
2 Each SA 7. Knurled Screws
2 Each SA 8. Studs
2 Each SA 9. Flat Head Screws (Long)
2 Each SA 10. Flat Head Screws (Short)
2 Each SA 11. Slotted Nuts
1 Each SA 12. 19mm Tie Rod
1 Each SA 16. 114-152mm Tie Rod (adjustable)
1 Block .5mm
1 Block 2.0005mm
1 Block .5mm
1 Block 2.0005mm
8 Blocks, 125mm, 150mm, 175mm, 200mm,
250mm, 300mm, 400mm, 500mm
Accessories Included:
6 Each SA 8. Studs
2 Each SA 9. Flat Head Screws (long)
2 Each SA 10. Flat Head Screws (short)
2 Each SA 20. 502mm Tie Rods
Same as Above SS 8.MA1X
•
Catalog No.
S2S 45.MA1
S2S 45.MA1X
S2S 88.MA1
S2S 112.MA1
SS 8.MA1X
SS 8.MAAX
NOTE: Sets include etched serial numbers and Commercial Grade Calibration Certificate. A Master Grade Calibration Certificate is available at extra cost.
469
STARRETT-WEBBER
GAGE BLOCKS
Square Steel or croblox® – Metric System
Gage Block Accessories
Metric
No. SA 25.MA.
Square Steel and croblox® Accessories
Square croblox® Wear Blocks
Size
2.0mm with
1 Side Countersunk
Catalog No.
SCM 2.0 WA1
** croblox® jaws available as an option at
extra cost. Please specify.
** Jaws are normally used in pairs,
but are ordered individually. Please
order accordingly.
NOTE: Set No. SS 8.MA1X and SS 8.MAAX
furnished with 6 studs, 2 short screws,
2 long screws, one each 114mm,
152mm, 298mm, 400mm tie rods
and two 502mm tie rods.
470
Description
Half-Round Jaw**
3mm Radius
6mm Radius
Straight Jaw**
12mm Thick
Scriber Point
Center Point 2mm C/L
Base Block 12mm Thick
Knurled Screw
Stud
Flat Head Screw
Long
Short
Slotted Nut
Tie Rods
19mm Solid
38mm Solid
57mm Solid
76mm Solid
114-152mm Adjustable
152-228mm Adjustable
Case (CS 9168.)
Tie Rods
298mm
400mm
502mm
•
Catalog No.
Steel
croblox®
45 Block Set
when ordered
Set No. SA 25.MA with Accessories
SA 101.
SA 102.
2
2
SA 103. SA 203.
SA 4.
SA 105.
SA 106.
SA 7.
SA 8.
2*
1
1
1
2
2
SA 9.
SA 10.
SA 11.
2
2
2
2
2
2
SA 12.
SA 13.
SA 14.
SA 15.
SA 16.
SA 17.
1
1
1
1
1
1
1
1
1
1
1
1
SA 18.
SA 19.
SA 20.
2
1
2
2
STARRETT-WEBBER
GAGE BLOCKS
Individual Rectangular and Square Gage Blocks - Metric System
croblox®, ceramic and steel
Size/Millimeters
croblox® Ceramic Steel
AA A1 AA A1 A1
Grade 00 0
00 0 0
0.3, 0.4*
0.5**
0.6 Through 0.9 in .1mm Steps*
1.0 or 1.0005
1.0 Wear Blocks
1.001 Through 1.009 in Steps of .001
2.0
2.0 Wear Blocks
2.5
15.0
20.0
25.0 and 30.0
40.0
50.0
60.0
70.0
75.0 and 80.0
90.0
100.0
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Square
Rectangular
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Rectangular Block Sizes
Width: ◆ All blocks are 9mm wide
Lengths: ◆ For blocks 10mm thick and under, length is 30mm
◆ For blocks 10.5mm thick and above, length is 35mm
Exceptions: *Blocks are 28.3mm long
**When ordering the 0.5mm block, specify length (28.3 or
30mm)
How To Order
◆ Specify in this sequence: shape, material, “M” for Metric, size, accuracy grade
Key:
Shape
Material
Metric
Size
Accuracy
R = Rectangular S = Steel
M
(listed in table)
S = Square
C = croblox®
Y = Ceramic
◆ Example:
RSM 2.0. A1 = Rectangular Steel block, Metric size 2.0,
Grade A1 Accuracy
Sizes/Millimeters
croblox®
A1
Grade 0
0.5 mm Only
1.0
1.5
2.0 Wear Blocks with
1 Side Countersunk
2.0 or 2.0005
15mm
20.0mm Only
25.0
30.0
40.0
50.0
60.0
70.0
75.0
80.0
90.0
100.0
•
Steel
A1
0
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Steel Only
Grade 00
125.0
150.0
175.0
200.0
250.0
300.0
400.0
500.0
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0
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•
Square Block Size
◆ All blocks are 24.1mm x 24.1mm
◆ Blocks have a 6.7mm hole in the center
◆ On blocks 5.0mm thick and over, the hole is countersunk
on both faces. (croblox® Wear Blocks are countersunk on
one face only)
471
STARRETT-WEBBER
GAGE BLOCKS
Standard Reference Bars
Inch
12⬙, 19⬙, 25⬙, 37⬙, 49⬙
Millimeter
300, 500, 650, 950, 1250mm
These Standard Reference Bars are
invaluable for use in checking table
movement of machine tools, accuracy
of vernier height gages, surface plate
transfer measurement, and for final
inspection of precision machine tools and
coordinate measuring machines.
The “channel design” places additional
measuring pads at appropriate points over
the length of the bar as reference points for
x, y or z axis measurements. Channel
design permits use of the bar on its base
(vertical) or on its back or either side
(horizontal). The alternating gage block
jaws and spacer blocks are permanently
wrung and fastened together to form 1⬙
increments for inch bars and 25mm
increments for metric bars.
A special bushing arrangement allows
the master stack to conform to thermal
conditions prevailing during use, thus
providing a true master even under less
than perfect laboratory conditions. Mating
surfaces are treated during assembly to
prevent corrosion.
Non-standard lengths and measuring
increments are available on special order. A
Certificate of Calibration is included. All
models are furnished with storage case.
Height Gages
Starrett/Webber-built height gages and
accessories are described elsewhere in
this catalog, as noted.
Left: DIGI-CHEK
Height Gage –
see Page 127.
Right:
DIGI-CHEK II –
see Page 126.
Standard Sizes are 12⬙, 19⬙, 25⬙, 37⬙ and 49⬙ in the inch system and 300mm,
500mm, 650mm, 950mm and 1250mm in the millimeter system.
Specifications
Description
Tolerance (Stack)
Maximum:
Minimum:
Parallelism: Gage surfaces
to Base and Each Other
Uncertainty of Calibration
Inch System
expressed in µin.
2.5L + 10 L in inches
- 10
Millimeter System
expressed in µm
.0025L + .25 L in millimeters
- .25
15 µin.
0.4 µm
10 + 2.0L L in inches
expressed in µin.
25 + .002L L in millimeters
expressed in µm.
Note: The accuracy of the surface that supports the gage must be taken into account when
determining the accuracy of any measurements
With Channel Design
Inch System
Size
Catalog No.
12"
RBC 12.
19"
RBC 19.
25"
RBC 25.
37"
RBC 37.
49"
RBC 49.
EDP No.
92626
92627
92628
92629
92630
Millimeter System
Size
Catalog No.
300mm
RBCM 300.
500mm
RBCM 500.
650mm
RBCM 650.
950mm
RBCM 950.
1250mm
RBCM 1250.
Free Standing Stack Without Channel Design – Vertical Position Only
Inch System
Size
Catalog No.
8"
RB 8.
10"
RB 10.
12"
RB 12.
18"
RB 18.
EDP No.
92616
92623
92624
92625
Millimeter System
Size
Catalog No.
200mm
RBM 200.
250mm
RBM 250.
300mm
RBM 300.
450mm
RBM 450.
Left: DIGI-CHEK
Reverse Reading
Blocks and Right:
DIGI-CHEK Riser
Blocks –
see Page 129.
472
EDP No.
93642
92617
93053
92619
92620
EDP No.
93261
93262
93263
93264
STARRETT-WEBBER
GAGE BLOCKS
Angle Gage Block Sets
Webber Angle Gage Blocks permit fast,
simple and accurate measurements of
any angle. They are far superior to sine
bar measuring methods, that involve
trigonometric formulae and complex
stacks of gage blocks.
Angle gage blocks come in three
accuracies, croblox® Reference Angle
Blocks with a 1-second accuracy, steel
Calibration Grade Angle Blocks with
2-second accuracy, and steel Working
Grade Angle Blocks with 5-second
accuracy. Each grade can be purchased in
sets that will measure in steps of onesecond, one-minute or one-degree to suit
any need. (See angle block specification
information on next two pages.)
◆ Reference Angle Blocks
croblox®: 1-second accuracy
Designed for optical or as reference
standards for autocollimators,
spectrometers, etc. They are
unsurpassed for use in aerospace,
optical and precision instrument fields.
◆ Calibration Angle Blocks
Steel: 2-second accuracy
The same high quality as the Reference
Grade Angle Blocks
◆ Working Angle Blocks
Steel: 5-second accuracy
These angles are designed for shop or
tool room. The longer gaging surfaces
are made for use with an indicator.
These blocks reduce set-up time
and minimize error in grinding both
simple and compound angles
Above: No. AG 16.R Below: No. AG 18.W.
Catalog
No.
AG 6.R
AG 6.C
AG 8.W
AG 11.R
AG 11.C
Note: The catalog numbers and
specifications of our angle gage blocks
have been changed in response to updated
requirements concerning the application of
the uncertainty of measurement. See the
next two pages for information regarding
the specifications of our angle blocks.
AG 13.W
AG 16.R
AG 16.C
AG 18.W
Description/
Accuracy Grade
Reference Grade
±1.0 Second
Calibration Grade
±2.0 Seconds
Working Grade
±5.0 Seconds
Reference Grade
±1.0 Second
Calibration Grade
±2.0 Seconds
Working Grade
±5.0 Seconds
Reference Grade
±1.0 Second
Calibration Grade
±2.0 Seconds
Toolroom
±5.0 Seconds
Blocks
Per Set
Measuring
Range
6
0-99º in 1° Steps 6 Blocks, 1°, 3°, 5°,
15°, 30°, 45°
11
16
Blocks Included
In Sets
0-99º in 1' Steps
6 Blocks, 1°, 3°, 5°,
15°, 30°, 45°
5 Blocks, 1', 3', 5', 20',
30'
6 Blocks, 1°, 3°, 5°,
15°, 30°, 45°
0-99º in 1" Steps 5 Blocks, 1', 3', 5',20'
30'
5 Blocks, 1", 3", 5",
20", 30"
NOTE: One 6⬙ (150mm) parallel and one 6⬙ (150mm) knife edge are included with Working Grade
Sets.
All sets furnished in case. Cases also available
separately. Order as follows: The Calibration Set
and the Reference Case No. is CS 9135. The
Working Case No. is CS 9134.
To order individually, specify in the following key sequence:
Key: AngleGage
Numeric Size
Angle Units
Prefix
of Angle
(Degree, Min., Sec.)
AG
45
D
Example: AG 45.DR = a Reference Grade 45º Angle Block
Accuracy Grade
R, C, or W
R
473
STARRETT-WEBBER
GAGE BLOCKS
Angle Gage Block Specifications
Accuracy In Microinches (Microns)
Reference Grade
Calibration Grade
Working Grade
®
Material
croblox
Steel
Steel
Tolerances: Deviation From Nominal
±1.0 second
±2.0 second
±5.0 second
Flatness of Gaging Surfaces
6µin. (0.15µm)
8µin. (0.20µm)
14µin. (0.35µm)**
Flatness & Parallelism of Sides
8µin. (0.20µm)
8µin. (0.20µm)
16µin.* (0.40µm)**
Squareness of Sides to Gaging Surfaces
6 seconds
8 seconds
12 seconds
†
Area of Gaging Surfaces
1" x 2" (25 x 50mm)
1" x 2" (25 x 50mm)
5/8" x 4" (16 x 100mm)
Surface Finish (Gage Surfaces Only)
0.4µin. AA (.01µm AA)
Estimated Uncertainty of Measurement (k=2) 0.6 seconds
1.0 seconds
3.5 seconds
Flatness tolerances exclude 1.5mm from the edges on all angle blocks except where marked with **. Then 3mm from the edge is excluded.
† Dimension of gaging surfaces in millimeters is approximate.
Using Angle Gage Blocks
Superior to Sine Bar Methods
A precision angle has always been difficult
to set because of the involved trigonometric
formula that is used with the sine bar.
The main difficulty lies in the dimension X
in diagram which often results in a figure
with many decimal places. Gage blocks can
only approximate this value. For example,
to measure 44º30⬘ using a 5⬙ sine bar the
following steps are required:
A
B
Sine for 44º30⬘⬘ angle
For dimension X multiply by 5
.7009093
3.5045465
.1005
Gage Blocks necessary
.104
to match this dimension
.300
3.000
3.5045000
3.5045465 – 3.5045 = Residual error .0000465
that the plus end of 45º block contacts the
minus end of 30⬘ block, and you have an
angle of 44º30⬘. It is not only easy to
accomplish, it is absolutely accurate.
With angle gage blocks, you take a 45º
block from the set, wring on a 30⬘ block so
This error cannot be eliminated in sine bar procedure.
Ease and Versatility
A set consisting of only 16 blocks will measure 356,400 angles in steps of one
second, to an accuracy of 1/5,000,000th of a circle! These micro-accurate blocks
can be used in either plus or minus positions. In “A”, right, example, take the 30º
angle and add the 5º angle to obtain a measurement of 35º (making sure that both
plus ends are together). In “B” use the same two blocks but wring them together
so that the minus end of the 5º block is over the plus end of the 30º block. This will
subtract 5º from 30º, thus giving your 25º measurement.
Indexing a Large Rotary Table
A Webber Angle Block or True Square is positioned on the work and a beam of light from an
autocollimator is directed against the gaging surface. This becomes 0º, or the reference
surface. Other angle blocks are then added in proper combination to measure each succeeding
angle. The table is rotated and inspected at each position with reference to the light beam. This
method indexes large workplaces quickly, with accuracy measured in fractional seconds.
Inspecting a Simple Angle
The photo below shows a
workpiece on which an angle of
30º is required. The workpiece is
resting on a parallel* which is
wrung to angle blocks forming
30º. The entire set-up is lined up
vertically with an angle plate and
then indicated across the top of
the work to determine the
correctness of the angle.
*Parallels are not necessary, but they
are convenient because of their
longer reference surface.
474
Setting a Revolving
Magnetic Chuck
A chuck is set for a 38º angle.
Three blocks, +30º, +5º and +3º,
are assembled and mounted with
the parallel*. The indicator quickly
tells if the setting is accurate.
Adjustment is a matter of
seconds. A revolving chuck teams
up perfectly with angle blocks to
make possible several
applications in tool grinding that
are more difficult with other
methods.
STARRETT-WEBBER
GAGE BLOCKS
True Squares
True squares are designed for fast,
precision indexing with angle gage blocks.
All faces of Webber True Squares are at
precisely 90º to adjacent sides, with perfect
optical flatness and parallelism to permit
use with autocollimators.
Applications for fast precision indexing and
setting of angular grinding fixtures are
almost unlimited. For example: the work
and the true square are mounted together
on a revolving fixture. A notch is ground by
two successive cuts, one at 90º with the
true square, and the other at 2º with the
addition of two angle blocks (+3º and –1º)
mounted on square. An indicator reading is
taken before each grind. This process is
then repeated by turning the True Square to
successive zero readings.
True Squares are designed for use as an
accessory to our angle gage blocks to
easily make angles greater that 45° and
through 180°.
Webber True Squares also permit a fast,
easy check of indexing tables. The gaging
faces are at precise 90° angles with optical
flatness and finishes that permit the use of
autocollimators.
NOTE: The catalog numbers and
specifications of our true squares have
been changed in response to updated
the uncertainty of measurement.
True Square Specifications
Catalog No.
Grade
Material
Tolerances:
Deviation From Nominal
Flatness of Gaging
Surfaces
Flatness & Parallelism
of Sides
Squareness of Sides to
Gaging Surfaces
TS 21.R
Reference
croblox®
TS 21.C
Calibration
Steel
TS 44.W
Working
Steel
TS 66.W
Working
Steel
±1.0 second
±2.0 second
±5.0 second
±5.0 second
6µin.
(0.15µm)
8µin.
(0.20µm)
8µin.
(0.20µm)
8µin.
(0.20µm)
14µin.
(0.35µm)**
16µin.
(0.40µm)**
14µin.
(0.35µm)**
16µin.
0.40µm)* *
6 seconds
8 seconds
12 seconds
12 seconds
1" x 2"
(25 x 50mm)
0.6µin. AA
(.015µm AA)
5/8" x 4"
(16 x 100mm)
1.0µin. AA
(.025µm AA)
5/8" x 6"
(16 x 150mm)
1.0µin. AA
(.025µm AA)
1.0 seconds
3.5 seconds
4.0 seconds
† 1" x 2"
(25 x 50mm)
0.4µin. AA
(0.1µm AA)
Surface Finish
(Gage Surfaces Only)
Estimated Uncertainty of
0.6 seconds
Measurement (K=2)
Flatness tolerances exclude 1.5mm from the edges on all angle blocks except where marked with
**. Then, 3mm from the edge is excluded.
Case included with all true squares.
475
STARRETT-WEBBER
GAGE BLOCKS
True Squares
True squares are designed for fast,
precision indexing with angle gage blocks.
All faces of Webber True Squares are at
precisely 90º to adjacent sides, with perfect
optical flatness and parallelism to permit
use with autocollimators.
Applications for fast precision indexing and
setting of angular grinding fixtures are
almost unlimited. For example: the work
and the true square are mounted together
on a revolving fixture. A notch is ground by
two successive cuts, one at 90º with the
true square, and the other at 2º with the
addition of two angle blocks (+3º and –1º)
mounted on square. An indicator reading is
taken before each grind. This process is
then repeated by turning the True Square to
successive zero readings.
True Squares are designed for use as an
accessory to our angle gage blocks to
easily make angles greater that 45° and
through 180°.
Webber True Squares also permit a fast,
easy check of indexing tables. The gaging
faces are at precise 90° angles with optical
flatness and finishes that permit the use of
autocollimators.
NOTE: The catalog numbers and
specifications of our true squares have
been changed in response to updated
the uncertainty of measurement.
True Square Specifications
Catalog No.
Grade
Material
Tolerances:
Deviation From Nominal
Flatness of Gaging
Surfaces
Flatness & Parallelism
of Sides
Squareness of Sides to
Gaging Surfaces
TS 21.R
Reference
croblox®
TS 21.C
Calibration
Steel
TS 44.W
Working
Steel
TS 66.W
Working
Steel
±1.0 second
±2.0 second
±5.0 second
±5.0 second
6µin.
(0.15µm)
8µin.
(0.20µm)
8µin.
(0.20µm)
8µin.
(0.20µm)
14µin.
(0.35µm)**
16µin.
(0.40µm)**
14µin.
(0.35µm)**
16µin.
0.40µm)* *
6 seconds
8 seconds
12 seconds
12 seconds
1" x 2"
(25 x 50mm)
0.6µin. AA
(.015µm AA)
5/8" x 4"
(16 x 100mm)
1.0µin. AA
(.025µm AA)
5/8" x 6"
(16 x 150mm)
1.0µin. AA
(.025µm AA)
1.0 seconds
3.5 seconds
4.0 seconds
† 1" x 2"
(25 x 50mm)
0.4µin. AA
(0.1µm AA)
Surface Finish
(Gage Surfaces Only)
Estimated Uncertainty of
0.6 seconds
Measurement (K=2)
Flatness tolerances exclude 1.5mm from the edges on all angle blocks except where marked with
**. Then, 3mm from the edge is excluded.
Case included with all true squares.
475
STARRETT-WEBBER
GAGE BLOCKS
Optical Polygons
Webber Optical Polygons provide an easy,
accurate method of checking and calibrating
angles. They are designed for use with
autocollimators in measuring angle spacing.
The exclusive one-piece design provides
compact, fixed master for precise angle
spacing. Target faces are highly reflective
and optically flat.
A 1 mounting hole, flanged bushing,
lapped washer and hold-down bolt,
furnished with each unit, permit
mounting the polygon in any
desired attitude. Available
in two accuracy grades.
Furnished in case. Certificate
of Calibration included.
Chrome carbide polygons provide a hardness
of Rockwell 71-73 C and a corrosion
resistance 10-20 times that of 18-8
stainless steel, resulting in lifetime accuracy.
Maintenance problems are virtually
eliminated due to their ruggedness and
extreme stability.
To order polygons, specify number in the
following key/sequence:
Optical Polygon OP
No./Faces
Decimal
Accuracy Grade
Example: OP 3.0 = A 3-sided optical polygon
with a 0 Reference Accuracy
croblox Reflecting
Cubes
®
Stable and maintenance free, reflecting
cubes are ideal for 90º indexing or
alignment in optical tooling or inspection.
Reflectivity: 55% in visible spectrum,
87-88% at 10.6 microns.
Starrett-Webber stocks semi-finished
solid cube blanks in four standard sizes:
3/4 (19.0mm), 1 (25.4mm),
1 1/2 (38.1mm) and 2 (50.8mm). Also
available as standard is a .950 (24mm)
square with a 17/64 (6.7mm) countersunk
center hole.
Specifications
No. of
Sides
3
4
5
6
8
9
10
12
Angle
Spacing
Degrees
120
90
72
60
45
40
36
30
Accuracy
Grade
Reference
0
Calibration
1
Diameter Across
Corners
Height
Inch (mm)
Inch (mm)
Target
Size
Inch (mm)
2.90
(73.6mm)
75 x .75
(19 x 19mm)
.880
(22.3mm)
Target
Area
Flatness*
Accuracy of
Calibration
(Uncertainty)
4 µin.
(.10 µm)
±1.0 sec.
Area Area
Sq. In. Sq. Cm.
.56
3.60
Maximum Deviation of
Faces from Nominal
3-12
±1.0 sec.
±2.0 sec.
*Excludes .020 (0.5mm) from edges.
ALL SIZES: Flatness and parallelism – top and bottom –.00005; maximum pyramidal error ±15 seconds.
To order, specify the following information:
(1) The number and position of all finished sides, including the base:
NOTE: for fixturing purposes during manufacturing, the bottom face must be one of
the finished sides. The bottom face is etched with the Webber logo, a serial number,
and face identifications as applicable.
Example #1: 4 sides: Top, front, Left, and Base.
Example #2: 3 sides: Front, Right, an Base.
(2) Specify the manufacturing tolerances of the 90° angles, 1 second, 3 seconds, or
other angular specification. NOTE: Our uncertainty of measurement is estimated to be
±1.0 seconds. This uncertainty should be added to the manufacturing tolerance to
give pratical tolerance of the cube.
(3) Specify if a Certificate of calibration is needed, at extra cost.
NOTE: Other sized cubes up to 2-inches are available on special order. Through holes, etched reticules, or threaded holes into stainless steel inserts may
also be specified at extra cost.
476
STARRETT-WEBBER
GAGE BLOCKS
Gage Block Stones
If a block does not wring together with
other blocks, it may be the result of nicks
or other damage. Examine blocks carefully
with a magnifying glass. If a small burr
is found, it may be removed with a gage
block stone.
Starrett-Webber stones, when used
moderately, may be rubbed directly on
the gaging surfaces without danger of
decreasing the size of the gage block.
Available in 3 styles/materials as listed.
GS 13 is recommended for use with steel
gage blocks
SAO 13 is recommended for general use.
Steel, ceramic, or carbide blocks
SAO 23 is recommended for use with
carbide and ceramic gage blocks
For Block
Material
Steel
Steel or Carbide
Chamois
These Starrett-Webber synthetic chamois
cloths, rather than natural chamois, are
recommended for wiping gage surfaces.
They can be used with solvents and oils,
including Starrett M-1® All-Purpose
Lubricant, and are washable in detergents.
Description
Dry
Lubricated
478
Catalog No.
CH 1.
CH 2.
Description
Black Granite Stone, 1/4 x 1 x 3⬙ (6.3 x 25 x 75mm)
Sintered Aluminum Oxide, 5/16 x 1 x 3⬙ (8 x 25 x 75mm)
Serrated Aluminum Oxide With Case,
1 x 2 x 3⬙ (25 x 50 x 75mm)
Catalog
No.
GS 13.
SAO 13.
SAO 23.
STARRETT-WEBBER
GAGE BLOCKS
Accredited Gage Block Calibration Service
In accordance with: ISO 17025
ANSI/NCSL Z540-1
ISO 10012-1
former MIL-STD-45662A
Master Grade Calibration
Commercial Grade Calibration
The calibration procedure is regarded as a process to be controlled
and monitored using SPC techniques. Information that would
enable the analysis of control data is to be recorded and made
available to the user upon request (at extra cost). A second master,
sometimes referred to as a control block, is used in the calibration.
The purpose of the second master is to generate known difference
readings which can be plotted and analyzed. The average of the
known differences of several readings of the two masters and the
range of their differences can be analyzed using statistical
techniques. The calibration process can be demonstrably controlled.
Calibrations are performed using the same program as our Master
Grade calibrations except that the second master, the control block,
is omitted. By omitting this control block some of the statistical
tests are also omitted which results in larger uncertainty.
Our Reference Gage Blocks are calibrated directly by the National
Institute of Standards and Technology. All other Reference Standards
are periodically checked and calibrated either by NIST or NVLAP
accredited laboratories. Documented histories are maintained.
Statistical methods are used to control the master gages.
All necessary information required to confirm the calibration and
calculations is captured. All raw data from the comparator, the
temperature of the blocks, the temperature of the comparator, and
the relative humidity of the surrounding environment is recorded for
each measurement. Applied correction factors are to be broken
down and recorded as well as the results of any calculations. The
measurement uncertainty is individually computed for each size.
Reported measurement uncertainties based upon a 95%
confidence level (two standard deviations) are dynamic, reflecting
the current performance of the specific equipment and operator.
Other factors included in the stated uncertainty are derived from a
detailed error analysis. The error analysis is based upon
experimentation whenever possible or industry consensus from
estimates derived from NIST publications. Experimental checks of
the stated uncertainty levels are made using laboratory comparison
techniques involving both internal repeatability studies and external
comparisons with other calibration laboratories.
The checks and balances under the Master Grade guidelines require
considerably more time and effort than the Commercial Grade
Calibrations. The entire process is under constant review and testing.
NOTICE: Webber Gage cannot recommend recalibration due
dates on our calibration certificates or calibration stickers.
Recalibration due dates must be provided to us at the time of
order. If this information is not provided, the recalibration due
date will be left blank for the user to add.
All necessary information to confirm the calibration is recorded. All
raw data from the comparator, the temperature of the blocks, the
temperature of the comparator, and the relative humidity of the
surrounding environment is recorded for each measurement.
Applied correction factors are broken down and are recorded, as
well as the results of any calibrations.
Our Reference Gage Blocks are calibrated directly by the National
Institute of Standards and Technology. All other reference
standards are calibrated either by NIST or NVLAP accredited
laboratories. Documented histories are maintained of our
measuring and test equipment. Statistical methods are used to
control our Master Gage Blocks.
Reported uncertainties are based on a 95% confidence level.
Experimental checks of the uncertainty are made using laboratory
comparison techniques involving repeatability studies and external
comparisons with other calibration laboratories.
Approximate Best Uncertainty Values
for blocks up through 4⬙ (100mm) in length
Master Grade
Commercial Grade
Grade
Uncertainty
Minimum Uncertainty Minimum
0.65 + 0.7L
1.4 µin.
Webber LM
not available
.016 + .0007L .035 µm
1.2 + 0.7L
1.7 µin. 1.6 + 1.0L 2.4 µin.
B89.1.9 00
.03 + .0007L .045 µm .04 + .001L .060 µm
1.8 + 0.7L
2.0 µin. 2.0 + 1.0L 3.0 µin.
B89.1.9 0
.045 + .0007L .050 µm .05 + .001L .075 µm
2.0 + 0.7L
2.0 µin. 2.0 + 1.0L 3.0 µin.
B89.1.9 AS1
.05 + .0007L .050 µm .05 + .001L .075 µm
NVLAP® accreditation does not constitute an endorsement of any
product by NVLAP or any agency of the U.S. Government.
479
STARRETT-WEBBER
GAGE BLOCKS
Gage Block Recalibration Service
Our calibration service catches worn gage blocks before trouble
starts … eliminating costly production inaccuracies. Be sure to
have your gage blocks checked regularly.
Starrett-Webber Gage Division offers all gage block users a complete
calibration service as insurance against production inaccuracies.
4.
Any brand of used rectangular, square or heavy-duty gage blocks
will be calibrated and the deviation from the marked size of each
block will be shown on the Certificate of Calibration. All linear
measurements are based on the new International Inch or Meter.
5.
For obvious reasons, Starrett-Webber does not calibrate new gage
blocks of other brands.
6.
are longer wearing and more stable than steel masters. StarrettWebber Grand Master Gage Blocks are calibrated directly by the
U.S. National Institute of Standards and Technology (NIST).
A computer automatically processes the Certificate of Calibration
to insure complete accuracy in recording gage block size. This
certificate shows the deviation from the marked size of each
block and marks those sizes which need replacing.
A quotation is then prepared showing the costs of any
recommended replacements in the original material and
croblox®, if applicable.
If no replacements are required, or if you have issued
instructions to only calibrate and return the set, the gages are
packed and returned to you with a Certificate of Calibration
showing the “as found” readings.
If you authorize the replacements, your Certificate of Calibration
is marked to indicate which blocks were replaced and the date
of replacement. However, if you wish, an “as found” and an “as
left” certificate can be made at extra cost.
This gage block calibration service is done promptly, and blocks
are ready to be returned to you within a few days after their receipt
by Starrett-Webber.
7.
1. After your gage block set arrives in the Starrett-Webber receiving
room, it is given a receiving number and each block is cleaned to
remove oil, grease and film. The case is also thoroughly cleaned.
2. Next, each block is lightly stoned to remove small nicks and
burrs. This does not guarantee that the blocks will wring if they
are heavily nicked, scratched, or burred.
3. Your gage blocks are then individually compared with master
blocks which are accurate to fractions of one millionth of an
International Inch. Starrett-Webber Grand Master Blocks are
Starrett-Webber croblox® (solid chrome carbide) and therefore
Calibration Service
When sending gage blocks to Starrett-Webber Gage Division for
calibration, please specify whether we are to (A) calibrate, issue
certificate and return only; (B) Calibrate, advise condition and hold
for instructions; or (C) Calibrate, replace worn and missing blocks,
and return. If order specifies that worn and missing blocks should
be replaced, and the cost of replacement approaches that of a new
set, we will inform you, quote prices and wait for instructions.
Shipping Damage is Costly and Inconvenient
Please Protect Your Valuable Gage Blocks by Proper Packaging
Remember, gage block cases are made for immobile storage –
not as shipping crates.
Follow these steps when preparing your gage blocks for shipment:
1. Gage blocks should be treated with rust preventative such as
Starrett M-1® Lubricant.
2. Place waxpaper over the blocks.
3. If necessary, place Kimpak or similar cushioning inside lid to
prevent jiggling of blocks in the inserts. Do not force lid closed.
4. Seal the closed case with nylon or fiberglass reinforced heavy
tape. The clasp will not hold in shipping nor will paper tape.
5. Use a strong outer shipping container large enough to allow
sufficient, firm cushioning material to withstand shock in transit.
6. Mark outer carton plainly, “DELICATE INSTRUMENTS –
FRAGILE”.
LABEL “DELICATE
INSTRUMENT
FRAGILE”
CUSHIONING
MATERIAL
CORRUGATED BOX
NYLON TAPE
Example of a set damaged in transit due to improper packaging.
480

starrett-webber gage blocks

Transcription

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